title: The effect of lattice strain on the catalytic properties of Pd nanocrystals.
abstract: The effect of lattice strain on the catalytic properties of Pd nanoparticles is systematically studied. Synthetic strategies for the preparation of a series of shape-controlled Pd nanocrystals with lattice strain generated from different sources has been developed. All of these nanocrystals were created with the same capping agent under similar reaction conditions. First, a series of Pd nanoparticles was synthesized that were enclosed in {111} surfaces: Single-crystalline Pd octahedra, single-crystalline AuPd core-shell octahedra, and twinned Pd icosahedra. Next, various {100}-terminated particles were synthesized: Single-crystalline Pd cubes and single-crystalline AuPd core-shell cubes. Different extents of lattice strain were evident by comparing the X-ray diffraction patterns of these particles. During electrocatalysis, decreased potentials for CO stripping and increased current densities for formic-acid oxidation were observed for the strained nanoparticles. In the gas-phase hydrogenation of ethylene, the activities of the strained nanoparticles were lower than those of the single-crystalline Pd nanoparticles, perhaps owing to a larger amount of cetyl trimethylammonium bromide on the surface.
authors.affiliation: Department of Chemistry, Boston College, 2609 Beacon St., Chestnut Hill, MA 02467 (USA).
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Kuo
authors.forename: Leo K
authors.initials: LK
authors.lastname: Lamontagne
authors.forename: Casey N
authors.initials: CN
authors.lastname: Brodsky
authors.forename: Lien-Yang
authors.initials: LY
authors.lastname: Chou
authors.forename: Jia
authors.initials: J
authors.lastname: Zhuang
authors.forename: Brian T
authors.initials: BT
authors.lastname: Sneed
authors.forename: Margaret K
authors.initials: MK
authors.lastname: Sheehan
authors.forename: Chia-Kuang
authors.initials: CK
authors.lastname: Tsung
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry; D002384:Catalysis; D005030:Ethylenes / Q000737:chemistry; D005561:Formates / Q000737:chemistry; D006865:Hydrogenation; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*
chemical_list: D005030:Ethylenes; D005561:Formates; C030544:formic acid; D010165:Palladium; D002248:Carbon Monoxide; C036216:ethylene
keywords: electrochemistry; heterogeneous catalysis; nanoparticles; oxidation; palladium